Radioreceiver



April 10, 1934. M. PERKINS RADIORECEIVER Filed May 1, 1930 2 Sheets-Sheet l A ril 10, 1934. L, PERKINS RADIORECEIVER Filed May 1, 1930 2 Sheets-Sheet 2 Patented Apr. 10, 1934 UNITED STATES PATENT OFFICE RADIORECEIVER Delaware Application May 1, 1930, Serial No. 448,923

2 Claims.

This invention relates to a radio receiver and more particularly to the supports for the electrical apparatus.

An object of this invention is to provide a support for the tuning elements that are mounted on a common shaft so that these tuning elements may easily be aligned upon being mounted in the radio receiver. This has been accomplished by providing a support for each of the tuning elements that has a bulge provided with a face parallel to the wall for carrying the tuning element, the face of the bulge forming a suitable and flexible support.

Another object of this invention is to provide a support for a tube that has a tendency to reduce microphonic noises caused by mechanical vibrations and external vibrations of the tube. This support includes a box-like structure provided with an aperture for receiving the bulb, said aperture being cushioned so as to rigidly engage the bulb of the tube.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a fragmentary side elevation of the radio receiver with a side wall of the receiver removed and part shown in section.

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary plan view with the cover removed of one stage of the radio frequency amplifler of a radio receiver.

Figs. 4 and 5 are enlarged sectional views of the driving mechanism taken substantially on the lines 4-4 and 5-5 respectively of Fig. 1.

In the drawings the reference character 10 in- 7 dicates the bottom of a radio receiver case provided with the side walls 12 and 14, the end walls 16 and 18 and the cover 20. Mounted within the casing is found the partition 22 and 24, each of which provides a support for the electrical apparatus that goes into a stage of the radio receiver. For the sake of clearness, only variometers 26 and tubes 28 of the electrical apparatus have been shown.

The partitions, only two of which have been shown, are provided with a protrusion or bulge 30 having the flat face 32 provided with an aperture 34 for receiving an extension or trunnion 36 of the stator 38 of the variometers 26. The face 32 has also been provided with an aperture for receiving the screw 40, threadedly engaging the stator 38 as best seen in Fig. 1. From this structure it can readily be seen that the several stators 38 that normally must be aligned, if not accurately aligned, may easily be aligned by passing the shaft 42 through the stators as the stator is only connected to the bulge 30 by the screw 40, the bulge forming a flexible support. The shaft 42 carries the rotors 44 and has one end fixedly attached to a sleeve 46, carrying a gear 50, meshing with the gears 52 and 54, mounted on the studs 56 and 58 respectively. The gears 52 and 54 are attached to the gears 60 and 62 respectively, each meshing with the gear 64, attached to the flexible cable 66 through a thimble 68. The details of the driving mechanism are not described in this applica- 70 tion for the reason that these form the subject matter of my copending application Serial No. 393,064, filed September 16, 1929. It can readily be seen that as the flexible cable 66 is rotated the rotors 44 attached to the shaft 42 will be rotated in union, but at a reduced rate of speed from that of the cable 66.

The partitions 22 and 24 are provided with a horizontal ledge 70, supported by the upright 72, resting on the bottom 10 and attached thereto by suitable screws 76. The ledge 70 is provided with apertures for receiving the tube socket 78, held thereon by screws 80.

When a radio receiver is mounted in motor vehicles or other movable conveyances, it is quite necessary to support the tube 28 from the swaying of the motor vehicle and from the vibration caused by its motor. In this invention this has been done by providing a box like support 82 having an aperture in the top that is lined by cushioning material 84 such as felt or the like that engages the bulb 86 of the tube so as to prevent the tube from vibrating, thereby setting up no microphonic noise in the radio and thereby protecting the tube and extending its useful period.

A member 90 attached to the wall or partition 22 and having substantially a U-shaped cross sectional area is provided with an aperture for receiving the tube socket 92 and another aperture lined with a felt member 96 for engaging the bulb 98 of the tube that may be used for an audio frequency amplifier. Especially in case of resistance coupled amplifiers two of these tubes may be arranged side by side on member 90.

In radios where there is high amplification per stage it is necessary to use good shielding material intermediate the stages, when this is desired, the partitions, sides, the ends, the bottoms and the cover of the casing are preferably made from 10 copper. In order to insure a good electrical contact between the cover 20 and the partitions 22 and 24, the partitions extend above the upper edge of the side and end walls so that the cover 20 may be screwed against the partitions 22 and 24.

Although in the above modification, only two stages of audio amplification has been shown and although variometers have been used for tuning; this invention is not limited to this number of stages of amplification and to the use of variometers as tuning, as other tuning devices, such as condensers could be used with only a slight modification.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1.,In a radio receiver having a plurality of aligned tuning means each including stator and rotor elements, a support foreachof the tuning means, said support including a wall, a bulge in the wall for carrying the tuning means, said bulge being provided with a face having at least two apertures therein, one of the apertures receiving the stator and another aperture receiving a screw threadedly engaging the stator and forming a pivot therefor, a drive shaft, said drive shaft supporting said rotors and journaled in each end of said stators so that the shaft aligns the free "end of each or said stators.

2; In a radio receiver having a plurality of aligned variometers, a support for each of the variometers, each support including a wall, a bulge in the wall for carrying the variometer, said bulge being provided with a face having apertures therein, one of the apertures receiving oneend oi the stator, means received by another aperture for pivotally attaching the stator to the bulge, a common shaft extending through the stators of said variometer and through the apertures receiving the stators, said pivotal means permitting the free end of each stator to be moved about and to align the free end of the stator with the, pivotal end so that the stators are automatically aligned. l

LAURENCE M. PERKINS. 

